1. Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge, CB3 0HE, United Kingdom
2. Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, OX1 3PU, United Kingdom
3. Department of Physics, Imperial College, London, SW7 2AZ, United Kingdom
4. School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
5. Center for Hybrid Quantum Networks (Hy-Q), Niels Bohr Institute, 2100 Copenhagen, Denmark